Relay



April 12, 1938. L. s. HARRISON 2,113,617

RELAY A Filed April 19, 1935 2 Sheets-Sheet l 44 55 43 g 4 26 j 5l 52uwgllwu--m @ily-iv NVENTOR. 6 MQ ATTO Ey April 12, 1938. L. s. HARRISON2,113,617

RELAY Filed April 19, 1935 2 sheets-sheet 2 IN V EN TOR.

' ATToR Y n Patented Apr. 12,`

OFFICE j SAMU RELAY l Inrenoes. Harrison, Binghamton. N. Y., assignor toInternational Business Machines Oor- ;otion, New York, N. Y.,aces-poration o( New sppumam spi-n 1o, ms. sei-isi No. '17.246

'z cum.. (ci. rus-.sw-

This invention relates to electrically controlled vmechanisms and moreparticularly toa relay which is responsive only to currents of certainfrequency characteristics. lThe invention still more speciilcallyrelates to relays responsive to certain frequency characteristics of thevibrating reed type by means of which reeds tuned to vvibrate inresonance with certain' frequencies operate to close oropen lcontacts orboth for the purpose of selectively controlling circuits.

It is the .object of this invention to provide a relay having two'circuit controlling contacts each controlled by frequency respondingmemb'ers adapted to be responsive at diiferent frequencies.

Another object ol' this invention is to provide a relay havinga resetmechanism' for restoring the relay contacts to normal position afterhaving been moved out of normal position by actuation of the relay.

Still another object is to provide La. relay having twotuned reedssurrolmded by a single coil, each-reed being responsive to a diil'erentfrequency of current passing through said coil.

A still further object is to provide a relay in n* which tuned reeds areresponsive to diileret current frequencies transmitted to said relay andin` which each reed supports an ann of a contact which is tripped toactuate said contact upon vibration of the reed corresponding to said fcontact.

embodying the invention'or from an inspection of the accompanyingdrawings, and the invention also constitutes certain newand novelfeatures bracket 1 is mounted which supports' a square shaped magnetyoke 8, the upper horizontal side of which terminates in `pole faces lleaving a small air gap Il (Fig. 3). The lower horizontal side Ii of theyoke has integral with it a boss 5 I2 which has an extension I3 on oneside to v which reeds I4 and li are anchored. The extensions I-8 act asa stiil'ener and are of different lengths selected to anchor the reedsin such a way that each has a diiferent but deilnite period 10' ofvibration Thus the reed that is supported lowest down with the shortstiifener will have 'a slower period ofvibration than the reed which hasthe stiener 'extended higher along the reed. In the present 15 lowerfrequency; i. e., 60 cycles and normally holds the reeds in a verticalposition -so that the ends are held steady substantially in the centerIof the air gap Il between the pole faces (Fig.13).' v The bracket Il isJformed upwardly at one end and to this end are mounted two groups ofcontactsprings insulated from each other'and terminating in contacts Iland il for onesroup and 2l and 2l for the other group. The centercontact springs have contact arms 23 and 24. exv tending at right anglesto thecontact springs.

"Ihesecontact'armseachextendacrosstheplane 35ofoneofthereedssothattherelsonecontact arm corresponding to andassociating with each tunedreed. Flxedtotheend of eachcontact annisarigid dependingmember 2l whichrestsontheendofthereeddirectlyunderitasviewed 40inl'lgsothatbothcontactarmsarethusnormally supported by itscorresponding reed and lsuch a position contact I and 2| are normallyclosed. It will be seen that if either one or both close. It

so that the end or the depending member 25 is raised above the end oflits corresponding reed, the reed will assume its normal position so thatwhen the contact arm is lowered the depending member 25 will again reston the end of reed iti and the contacts 26 and 2i will be restored totheir normal or original position.

To accomplish this restoration a reset mechanism is provided. A bracket26 is mounted on the base 6 and on this bracket is mounted a magnet 21and a cylinder 28 of an air dash pot. The magnet coil is enclosed in ametal cylindrical jacket and cooperates with a solenoid plunger 23extending into the core of the magnet winding. The plunger 29 ispivotally fastened to an arm 36 which is in turn pivotally mounted at 3ito an extension 32 xed to the metal jacket oi the magnet coil.

The opposite end of the arm 36 is pivotally connected to a link 33 whichis in turn pivotally fastened to an arm 34. The arm is pivotally mountedat 35 to the bracket 26, (Fig. 2). The arm 34 is biased in a clockwisedirection by means of a spring 36 fastened between its upper end and astud 31 on the bracket 26. The lower end of the armo 34 is bifurcatedand engages a pin 38 in the end of the piston 39 which is slidablymounted within the air dash pot cylinder 28. An arm 46 is pivotally`mounted at 4I to the bracket 26 and is slightly biased in a clockwisedirection by a spring 42 which is fastened to said arm at one end and toarm 36 at the other end.

A projection 43 on the arm 46 is formed over to cross into the plane ofa pawl 44 which is pivoted vat 45 on the bracket 26 and is biased in aclockwise direction by the spring 46 fastened to said pawl and to a stud41 on the bracketnrember which also acts as a limit stop for themovement of the arm 46 in a counterclockwise direction since theextension of said arm abuts said stud.

The pawl 44 is provided with a shoulder 49 which latches on theformed-over portion 43 of the arm 46 and prevents said arm turning in aclockwise direction unless unlatched. Pivoted to the arm 46 is a link 50which is pivoted at its other end to a U-shaped member 5I which is piv-.oted on the stud 31 mounted on the bracket 26 so that the legs of theU-shaped arm straddle the bracket. 'I'he other arm 52 of said U-shapedmember carries a stud 53 of suitable insulating material which extendsunder the contact arms 23 and 24 (Fig. 1). Thus if this U-shaped memberis turned in a clockwise direction, the stud 53 will lift both contactarms 23 and 24.

A stud 54 is provided on the arm 36 and cooperates With a` downwardlyinclined tail piece 55 on the pawl 44 so that a movement of the arm 36to the right will cause the stud to hit the tail piece and cam the pawl44 in a counter-clockwise direction to remove the shoulder 49 from itslatching position against the formed out portion 43 to permit the arm 46to rotate in a clockwise direction.

The operation of the reset mechanism is as follows:- Assuming one of thereeds have been vibrated to permit one of their associated contacts tofunction. The reset magnet coil 21 will become energized in a mannerlater to be explained in connection with the circuits. 'I'his magnetwill then draw its solenoid plunger into its coil rotating the arm 36clockwise about its pivot. This rotation will-be' retarded in its speedby the action of the dash pot as the arm 36 pushes the arm 34counterclockwise about its pivot through atraen' the link 33, and thuspushes the piston into the air chamber. As the arm 36 movescounterclockwise it increases the tension in the spring 42 fastened toarm 46 since said arm is latched against rotation by the pawl 44 aspreviously described. As the arm 36 approaches its limit of travel in aclockwise direction, the stud 54 cams the pawl 44 out of latchingposition, as previously explained, and the arm 46 is moved in acounterclockwise direction by the increased tension in the spring 42,and by means of the link 56- rotates the arm 5I of the U-shaped memberin a clockwise direction to lift the contact arms to a height suilicientto permit the reeds to be restored to a supporting position for saidcontact arms. o

When the restoring magnet is deenergized the spring 36 rotates arm 34clockwise and pushes the link 33 to the left as viewed in Fig. 2. Thepivot stud 51 is provided with an extension which extends into the planeof the link 50 and said link is provided with a shoulder 56. As the link33 is moved to the left the extension of said pivot stud 55 bearsagainst the shoulder 56 and causes the arm 44 to he movedcounterclockwise, this movement continuing until the extension 46strikes the limit stud 41 by which time the arm 46 has moved far enoughfor the shoulder 46 of pawl 44 to latch up behind the formed-overportion 43 of the arm 46.

'Iurning now to the wiring diagram shown in Fig. 4 to show thefunctioning of the relay. It will be understood that the closing ofcontacts I8 or 26 could be used to control relays or other equipmentwhich could be placed in parallel with the reset coil 21. It is thepurpose here however to describe and explain how the relay itself oper-Yates and not what it may control by its operation. Let it be assumednow that we have a regular 110 volt 60 cycle commercial current sourceof supply being transmitted over lines 66 and16l and that said currentisoperating a motor 62 which is connected by means of a shaft 63 to twohigh frequency generators 64 and 65,- generating currents of 1800 and1200 cycle frequency re# spectively. Blocking condensers 66, 61, 6I arid69, are provided i the circuit to prevent' the flowing back of the 60cycle frequency current or any other stray frequency other than for whatthat circuit is tuned for. Switches 16 and 1I are provided in thegenerator circuits and may be automatically operated by time controlledmeans or by cyclically operated cams, or numerous other well knownmethods, or they may be operated manually. depending on the use to whichthe relay may be put. It will be noted that the biasing coil I1 isconstantly energized, being connected across the 60 cycle lines 66 and6I by means of wires 12 and 13, with a resistance I1a in series withsaidcoil.

It will be further noted that one side of each generator is common andgrounded at 14. Now let it be assumed that the switch 1I is closed forone second and opened again. When said switch is closed a circuit iscompleted from one side of the 1200 cycle generator 66 through thecondenser 61, switch 1I,\wires 16 and 16, contact I6 (normally closed)condenser 66, main coil I6, to ground 11 and thence to ground connection14, wire 16 to the generator. The energlzation of the main coil I6 bythe 1200 cycle current will cause the reed I4 tuned to thatl frequencyto vibrateand cause contacts I6 to close and contacts I9vto open. Theopening of contactsiil will immediately open vthe circuit tothe maincoil and the closing of contacts Il will now close a circuit from line60 of the 60 cycle power line, through wires 19, 80, 1I and 1B, contactsI I (now closed), reset magnet 21, wire 13 to the other sideof thesupply line 6 I 'Ihe reset magnet then operates to reset the contacts aspreviously described, closing contacts I9 and opening contacts Il.Aspreviously stated, any suitable work or lcontrol circuit, can be takenfrom the reset magnet cillcuit such as shown by the dotted line circuitl In asimilar manner if the switch 10 is closed a circuit is establishedfrom one side of the 1800 cycle generator 64 through condenser 88,.switch 1l, wires l0, 1l and 82, contacts 2|, condenser 88, main coil Il,ground connection 11 to ground connection 14 and backto the generator84. The

4reed Ill tuned to'respond to this frequency will vibrate causingcontacts 2i to open and contacts 20 to close, again establishing acircuit through the reset magnet 21 from supply line 80 through wires19, Ill, 1l and 82, contacts 20 -(now closed) wire 83, reset magnet 21,wire 13 to supply line The energization of the reset magnet will againcause the contacts 20 and 2| to be reset to their normal position aspreviously explained.

While the fundamental and novel features of I v the invention as appliedto a single modification *have been shown anddescribed and pointed out,

vit will be understood that various omissions and substitutions andchanges in the form and details of the device illustrated and in itsoperation may be made by those skilled in the art without deand operableby the vibration of said members,

into a closed position, electromagnetic means for restoring said closedcontacts to open position and a circuit extending from said contacts tosaidelectromagnetic means whereby the closure of the contacts causes theelectromagnetic means vto become operable to restore said contacts from.closed to open position. l

2-1m electromagnetic device including a resonant reed having a certainresonant frequency,

means including electromagnetic means for vibrating said reed atresonant frequency, a circuit controller controlled by saidreed andoperable by the vibration of said reed for movement into operativeposition, electromagnetic means for restoring said circuit controller toinoperative position, a circuit extending from said .circuit controllerto said electromagnetic restoring means and another circuit extendingfrom said circuit' controller to said electromagnetic'vibrating meanswhereby the movement of saidcircuit controller into operative positionrenders the electromagnetic vibrating means ineffective and theelectromagnetic restoring means effective.

.3. An electromagnetic device including a resonant reed having a certainfrequency of vibraftion, means including electromagnetic means forvibrating said reedat resonant frequency, a circuit. controllercomprising a normally open contact and normally closed. contact, meanscontrolled by said reed for normally holding the last named contact inclosed position, said last-'named y anaal? means being operable by thevibration ofsaid reed at its resonant frequency for causing the normallyopen contact to be closed and the normally closed contact to be opened,and a circuit included in the ilrst named means extending from saidnormally closed contact to said electromagnetic vibrating means wherebythe opening of said normally closed contact terminates the vibration ofsaid reed by the electromagnetic means.

4. An electromagnetic device including a resonant reed having a certainfrequency of. vibration, means including electromagnetic means forvibrating said reed at resonant frequency, a circuit controllercomprising a normally open contact and a normally closed contact, meansnormally latched in position by said last named reed to hold saidcontact in closed position, said lastnamed means being unlatched by thevibration of said reed at its resonant frequency to cause the normallyopen contact to be closed and the normally closed contact to be opened,`electromagnetic means for restoring said contacts to normal position,and a circuit included in the nrst named means extending from saidnormally open contact to said electromagnetic means whereby the closingof said normally.Z opened contact renders the electromagnetic restoringmeans effective to restore said contacts to open position. 1.

5. An electromagnetic device including a resonant reed having a certainfrequency of vibration, means including electromagnetic means forvibrating said reed at resonant frequency, a circuit controller normallyheldin one position controlled by said reed and operable by thevibration of said reed for movement into an alternate position, arestoring device for restoring said circuit controller to its normalposition, said restoring device including an electromagnetl connected toa. circuit extending from restoring device and operable upon movement ofthe circuit controller to its alternate position, anv armature operatedthereby, a speed retarding device, and a member controlled by theconjoint operation of said speed llsl retarding device and saidarmature, whereby the operation of said electromagnet causes said memberto lmove'the circuit controller to its normal first named position.

6. An electromagnetic device including a plurality of resonant reedseach aving a dlerent frequency of vibration, electromagnetic means forvibrating each reed at its resonant frequency, said means including anelectromagnst for receivlng electrical current impulses of diiferentfrequencies .whereby the reeds are severally vibrated in response tocurrent impulses received by said electromagnet of frequenciescorresponding to the frequency of vibrati of said'reeds,

a plurality of circuit controllers normally held in a certain positioneach controlled by a different reed and operable by the vibration of itscontrolling reed for moving the circuit' controller controlled by saidvibrating reed into an alternate position, a restoring device forrestoring all circuit breakers to their normal certain positions, saidrestoring device including an electromagnet connected to circuitsextending to each of said circuit controllers and operable upon movementor any one of sale circuit controllers to its alternate position andmeans-operated by said electromagnet upon energization thereof forrestoring` said circuit controllers to their normal iirst named certainposition.

'loA

7. An electromagnetic device including e. resoswitching member to saidnormal position, and nant reed having a certain frequency of vibrameanscontrolled by said switching member for tion, Aelectromagnetic means forvibrating said causing the latter when moved to its alternate reed atresonant frequency, anwitching member position to render theelectromagnetic means incontrolled by said. reed and movable fromnoroperative and to renderthe restoring means 5 mal position to onalternative position ioy the operativeI Vibration of said reed, meansfor restoring seid LAURENCE S.. HARRISON.

